The Python ModuleNotFoundError: No Module Named ‘yaml’ occurs if you forget to install the pyyaml module before importing it, or if you installed it in the wrong environment. To fix the error, run the pip install pyyaml command to install the module.
Python ModuleNotFoundError: No Module Named ‘yaml’ Occurs For Multiple Reasons:
- Running
pip install pyyamldoes not install the pyyaml package. - Install the package in a different Python version than the one you are using.
- Install the package globally, not in your virtual environment.
- The Python version running in the IDE is incorrect.
- Name the module
yaml.pyto mask the official module. - Declare a variable called
yamlthat reflects the imported variable.
How To Fix ModuleNotFoundError No Module Named yaml?
Here are the solutions on How To Fix No Module Named yaml:
Open your terminal in your project’s root directory and install the pyyaml module.
Time needed: 5 minutes
How To Fix No Module Named yaml
- In a virtual environment or using Python 2.
pip install pyyaml - For python 3 (could also be pip3.10 depending on your version).
pip3 install pyyaml - If you get permissions error.
sudo pip3 install pyyaml
pip install pyyaml --user - If you don’t have pip in your PATH environment variable.
python -m pip install pyyaml - For python 3 (could also be pip3.10 depending on your version).
python3 -m pip install pyyaml - Using py alias (Windows).
py -m pip install pyyaml - For anaconda.
conda install -c conda-forge pyyaml - For jupyter notebook.
!pip install pyyaml
Conclusion
The Python ModuleNotFoundError: No Module Named ‘yaml’ occurs if you forget to install the pyyaml module before importing it, or if you installed it in the wrong environment. To fix the error, run the pip install pyyaml command to install the module.
Recommendation
By the way if you encounter an error about importing libraries, I have here the list of articles made to solve your problem on how to fix errors in Python libraries.
- ModuleNotFoundError: No Module Named Pycocotools
- ERROR: Error:0308010c:Digital Envelope Routines::Unsupported
- Only Size-1 Arrays Can Be Converted To Python Scalars
- ModuleNotFoundError: No Module Named ‘cv2’
- AttributeError: Module UMAP Has No Attribute UMAP
Inquiries
If you have any questions or suggestions about this tutorial, please feel free to comment below.
Frequently Asked Questions
What is Python ModuleNotFoundError and what causes it?
ModuleNotFoundError (a subclass of ImportError) is raised when Python cannot find the module you tried to import. Common causes: the package isn’t installed (pip install missing), wrong virtual environment activated, typo in module name, or Python can’t find your local module on the import path. The error message names exactly which module is missing.
How do I fix ‘ModuleNotFoundError: No module named X’?
Run pip install X first. If that succeeds but you still get the error, check which Python you’re using (which python OR python –version) vs which pip (which pip OR pip –version), they must match. Common gotcha: pip points to system Python 3.9 but you’re running python3.11 in a venv. Inside the venv, use python -m pip install X to be sure pip matches the active Python.
Why does my code work in one environment but not another?
Different Python versions or different installed packages. To diagnose: pip freeze > requirements.txt on the working environment, then pip install -r requirements.txt on the broken one. Use virtualenv (python -m venv venv) or conda for every project to avoid system-wide package collisions.
Is ModuleNotFoundError the same as ImportError?
ModuleNotFoundError is a subclass of ImportError added in Python 3.6. It specifically means ‘no such module exists.’ Plain ImportError covers a wider set: module exists but a name inside it can’t be imported (e.g. ‘cannot import name X from Y’). except ImportError catches both; except ModuleNotFoundError catches only the missing-module case.
Where can I find more ModuleNotFoundError fixes?
Browse the ModuleNotFoundError reference hub for 198+ specific module fixes (TensorFlow, Flask, Django, pandas, numpy, etc.). For related issues see ImportError. For broader Python setup see Python Tutorial hub.
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